论文部分内容阅读
地处甘肃省中部、祁连山东端、石羊河流域源头位置的天祝藏族自治县,境内海拔2040～4874米,属高寒、干旱、半干旱气候类型,年降雨量350～600毫米,且多集中在7、8、9三个月,年蒸发量1500～1700毫米,年均气温-1℃～1.3℃,极度低温为-30℃,全年日照时数2500～2700小时,相对无霜期77.8～95.8天。由于气温低、光照不足、生长期短、气候干旱等严酷的自然条件,对造林技术有着特殊的要求,因此采用科学的造林技术,可大大提高造林成活率。
Located in the central Gansu Province, the eastern end of the Qilian Mountains, the source of the Shiyang River Basin Tianzhu Tibetan Autonomous County, the territory of 2040 to 4874 meters above sea level, is a cold, arid, semi-arid climatic types, annual rainfall of 350 to 600 mm, and more concentrated In the 7,8,9 three months, the annual evaporation 1500 ~ 1700 mm, the average annual temperature of -1 ℃ ~ 1.3 ℃, the extreme low temperature of -30 ℃, the annual sunshine hours 2500 ~ 2700 hours, the relative frost-free period 77.8 ~ 95.8 day. Owing to the harsh natural conditions such as low temperature, insufficient light, short growth period, and arid climate, it has special requirements for afforestation technology. Therefore, adopting afforestation technology can greatly increase the survival rate of afforestation.